A-Level Biology - How the Heartbeat is Controlled - Pathway of Excitation | ECGs (2026/27 exams)

⭐️ Check out our website https://www.cognito.org/ ⭐️ *** WHAT'S COVERED *** 1. The myogenic nature of cardiac muscle * How the heart generates its own electrical impulses to contract rhythmically. * The influence of the nervous system on heart rate. 2. The pathway of electrical excitation in the heart * The role of the sinoatrial node (SAN) as the heart's natural pacemaker. * The function of the atrioventricular node (AVN) in creating a delay. * Conduction of the impulse through the bundle of His to the apex. * The role of the Purkinje fibres in ventricular contraction. 3. Electrocardiograms (ECGs) * What an ECG measures and how it represents the cardiac cycle. * How to interpret the P wave, QRS complex, and T wave. * How ECG traces can be used to identify heart abnormalities like tachycardia, bradycardia, atrial fibrillation, and ectopic beats. *** EXAM BOARD SPECIFIC INFO *** AQA - You don't need to know about ECGs OCR - Everything is relevant to your course! CIE - You don't need to know about ECGs *** CHAPTERS *** 0:24 The Myogenic Nature of Cardiac Muscle 1:21 Pathway of Electrical Excitation Through the Heart 2:48 What is an Electrocardiogram (ECG)? 3:12 Interpreting an ECG Trace 4:01 Common Heart Abnormalities on an ECG *** PLAYLISTS *** https://youtube.com/playlist?list=PLidqqIGKox7VzYfPIVt8T09xOLNcolCe4&si=8JmDajxjtba6rdc3 https://youtube.com/playlist?list=PLidqqIGKox7UZ3mWhbHv2aA_1vnbsfRPq&si=q3hEKdA4v7kbfwMe https://www.youtube.com/playlist?list=PLidqqIGKox7UTimdJ3eFcnt6xL9GUt2a6 https://youtube.com/playlist?list=PLidqqIGKox7XPh1QacLRiKto_UlnRIEVh&si=orIUwL3o2jOoiYjT https://youtube.com/playlist?list=PLidqqIGKox7X5UFT-expKIuR-i-BN3Q1g&si=DcihOwUkd9oWbbdp https://youtube.com/playlist?list=PLidqqIGKox7WeOKVGHxcd69kKqtwrKl8W&si=Y8MsO-FK948jnxpS https://youtube.com/playlist?list=PLidqqIGKox7UVC-8WC9djoeBzwxPeXph7&si=-7i5Iq7yOeJrhtu6 https://youtube.com/playlist?list=PLidqqIGKox7VKJD2WxRhoKaI6JGLVean8&si=NH_Q1ujhVgACM2FU #Alevel #Biology #study #revision #school #exam #AQA #OCR #Edexcel